I had a LOT of Seals and Crofts albums for a while. My college girlfriend even got me to see the duo live in New York City, on the birthday of Bahá’u’lláh, in 1971.
Summer Breeze entered the charts on 9/9/1972, spent 16 weeks on the charts, getting to #6. (S&C had three songs get to #6, including 1973’s Diamond Girl and 1976’s Get Closer), which is as high as they ever charted on Billboard.
Part of the info was that the Isley Brothers had a UK hit with the same song in 1976, which you can hear HERE.